1998 Ford transit based Duetto

Has anyone out there got a Foxguard alarm istalled in their Duetto?
We have had our Duetto since October of last year and we have no documentation on how the alarm is supposed to work.
It has a fob with two buttons .It would be handy if we knew exactly what functions the two buttons have.
It has a box under the bonnet and the alarm can be isolated by inserting a little key.
However although the alarm was isolated on the IOW ferry - it still went off when the ferry shook the van about a bit!
It does seem to have a mind of its own.
So I would very grateful for any information or documentation.
I have searched the 'net but there is little or no info although there does appear to be a South Africa based company that se ems to deal under that name.

These people offer spares and repairs for Foxguard:

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So they can probably tell you how it works - if you tell them what model you have.